/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.metrics.dropwizard;

import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.MetricRegistry;
import org.apache.iotdb.metrics.AbstractMetricManager;
import org.apache.iotdb.metrics.dropwizard.type.*;
import org.apache.iotdb.metrics.type.*;
import org.apache.iotdb.metrics.utils.MetricInfo;
import org.apache.iotdb.metrics.utils.MetricType;

import java.util.function.ToLongFunction;

/**
 * Metric manager based on dropwizard metrics. More details in https://metrics.dropwizard.io/4.1.2/.
 */
@SuppressWarnings("common-java:DuplicatedBlocks")
public class DropwizardMetricManager extends AbstractMetricManager {
    com.codahale.metrics.MetricRegistry metricRegistry;

    public DropwizardMetricManager() {
        metricRegistry = new MetricRegistry();
    }

    @Override
    public Counter createCounter(MetricInfo metricInfo) {
        return new DropwizardCounter(
                metricRegistry.counter(DropwizardMetricNameTool.toFlatString(metricInfo)));
    }

    @Override
    public <T> AutoGauge createAutoGauge(MetricInfo metricInfo, T obj, ToLongFunction<T> mapper) {
        DropwizardAutoGauge<T> dropwizardGauge = new DropwizardAutoGauge<>(obj, mapper);
        metricRegistry.register(DropwizardMetricNameTool.toFlatString(metricInfo), dropwizardGauge);
        return dropwizardGauge;
    }

    @Override
    public Gauge createGauge(MetricInfo metricInfo) {
        DropwizardGauge dropwizardGauge = new DropwizardGauge();
        metricRegistry.register(
                DropwizardMetricNameTool.toFlatString(metricInfo),
                dropwizardGauge.getDropwizardCachedGauge());
        return dropwizardGauge;
    }

    @Override
    public Rate createRate(MetricInfo metricInfo) {
        return new DropwizardRate(
                metricRegistry.meter(DropwizardMetricNameTool.toFlatString(metricInfo)));
    }

    @Override
    public Histogram createHistogram(MetricInfo metricInfo) {
        return new DropwizardHistogram(
                metricRegistry.histogram(DropwizardMetricNameTool.toFlatString(metricInfo)));
    }

    @Override
    public Timer createTimer(MetricInfo metricInfo) {
        return new DropwizardTimer(
                metricRegistry.timer(DropwizardMetricNameTool.toFlatString(metricInfo)));
    }

    @Override
    protected void removeMetric(MetricType type, MetricInfo metricInfo) {
        metricRegistry.remove(DropwizardMetricNameTool.toFlatString(metricInfo));
    }

    public MetricRegistry getMetricRegistry() {
        return metricRegistry;
    }

    @Override
    public boolean stopFramework() {
        metricRegistry.removeMatching(MetricFilter.ALL);
        return true;
    }
}
